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Blog Test

8-Aug-26

This is a test of custom blog capabilities. Click below for full article.

Blog Test

8-Aug-26

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[ HARDWARE_TUNER // v1.0 ]
--
AWAITING INPUT
PRESS TO ENABLE INPUT
const noteStrings = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]; let audioCtx = null; let analyser = null; let isRunning = false; let buf = new Float32Array(2048); async function initTuner() { const startBtn = document.getElementById('start-btn'); const noteOut = document.getElementById('note-out'); const freqOut = document.getElementById('freq-out'); const statusOut = document.getElementById('status-out'); const segments = document.querySelectorAll('.meter-segment'); if (isRunning) return; try { statusOut.innerText = 'CONNECTING TO MIC...'; const AudioContext = window.AudioContext || window.webkitAudioContext; if (!AudioContext) { statusOut.innerText = 'ERR: WEB AUDIO NOT SUPPORTED'; return; } audioCtx = new AudioContext(); if (audioCtx.state === 'suspended') { await audioCtx.resume(); } if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) { statusOut.innerText = 'ERR: REQUIRES HTTPS / SECURE SITE'; return; } const stream = await navigator.mediaDevices.getUserMedia({ audio: true }); const source = audioCtx.createMediaStreamSource(stream); analyser = audioCtx.createAnalyser(); analyser.fftSize = 2048; source.connect(analyser); isRunning = true; startBtn.style.display = 'none'; statusOut.innerText = 'SYSTEM ACTIVE // PLAY INSTRUMENT'; function updatePitch() { analyser.getFloatTimeDomainData(buf); let ac = autoCorrelate(buf, audioCtx.sampleRate); if (ac === -1) { noteOut.innerText = "--"; freqOut.innerText = "LISTENING..."; clearMeter(segments); } else { let pitch = ac; let note = noteFromPitch(pitch); let detune = centsOffFromPitch(pitch, note); noteOut.innerText = noteStrings[note % 12]; freqOut.innerText = pitch.toFixed(1) + " Hz"; updateMeter(segments, detune); } if (isRunning) { requestAnimationFrame(updatePitch); } } updatePitch(); } catch (err) { console.error("Tuner Error:", err); if (err.name === 'NotAllowedError' || err.name === 'PermissionDeniedError') { statusOut.innerText = 'ERR: MIC PERMISSION DENIED'; } else { statusOut.innerText = 'ERR: ' + (err.message || err.name); } } } function autoCorrelate(buf, sampleRate) { let SIZE = buf.length; let rms = 0; for (let i = 0; i < SIZE; i++) { let val = buf[i]; rms += val * val; } rms = Math.sqrt(rms / SIZE); if (rms < 0.01) return -1; let r1 = 0, r2 = SIZE - 1, thres = 0.2; for (let i = 0; i < SIZE / 2; i++) { if (Math.abs(buf[i]) < thres) { r1 = i; break; } } for (let i = 1; i < SIZE / 2; i++) { if (Math.abs(buf[SIZE - i]) < thres) { r2 = SIZE - i; break; } } buf = buf.slice(r1, r2); SIZE = buf.length; let c = new Array(SIZE).fill(0); for (let i = 0; i < SIZE; i++) { for (let j = 0; j < SIZE - i; j++) { c[i] = c[i] + buf[j] * buf[j + i]; } } let d = 0; while (c[d] > c[d + 1]) d++; let maxval = -1, maxpos = -1; for (let i = d; i < SIZE; i++) { if (c[i] > maxval) { maxval = c[i]; maxpos = i; } } let T0 = maxpos; let x1 = c[T0 - 1], x2 = c[T0], x3 = c[T0 + 1]; let a = (x1 + x3 - 2 * x2) / 2; let b = (x3 - x1) / 2; if (a) T0 = T0 - b / (2 * a); return sampleRate / T0; } function noteFromPitch(frequency) { let noteNum = 12 * (Math.log(frequency / 440) / Math.log(2)); return Math.round(noteNum) + 69; } function centsOffFromPitch(frequency, note) { return Math.floor(1200 * Math.log(frequency / (440 * Math.pow(2, (note - 69) / 12))) / Math.log(2)); } function clearMeter(segments) { segments.forEach(s => s.className = 'meter-segment'); } function updateMeter(segments, cents) { clearMeter(segments); let step = Math.min(Math.max(Math.round(cents / 10), -4), 4); segments.forEach(s => { let pos = parseInt(s.getAttribute('data-pos')); if (pos === step) { if (pos === 0) s.classList.add('active-tune'); else if (pos < 0) s.classList.add('active-flat'); else s.classList.add('active-sharp'); } }); }